Detachable steel rail drill bit

The utility model relates to the technical field of rail cutters. The utility model relates to a drill, in particular to a detachable rail drill. The drill bit comprises a steel rail drill bit consisting of a handle and a working part, a clamping groove is formed in the outer side surface of the handle part; a mounting groove for mounting the working part is formed in the top end of the handle part; the top end of the working part and the top end of the handle part are provided with locking grooves which are communicated and matched in size. A screw penetrating through the top end of the handle part and the working part is arranged in the locking groove, a cooling water hole communicated with the cavity bottom of the mounting groove is formed in the middle of the handle part, a side hole communicated with the cooling water hole is formed in the handle part and penetrates through the left side and the right side of the handle part, and the left end and the right end of the side hole arehigher than the joint of